Android实现顶部悬浮效果

<?xml version="1.0" encoding="utf-8"?>
<android.support.v4.widget.SwipeRefreshLayout xmlns:android="http://schemas.android.com/apk/res/android"
 xmlns:app="http://schemas.android.com/apk/res-auto"
 xmlns:tools="http://schemas.android.com/tools"
 android:id="@+id/swipeRefreshLayout"
 android:layout_width="match_parent"
 android:layout_height="match_parent"
 tools:context=".ui.activity.NewPersonalCardActivity">

 <android.support.design.widget.CoordinatorLayout
  android:id="@+id/rootLayout"
  android:layout_width="match_parent"
  android:layout_height="match_parent">

  <android.support.design.widget.AppBarLayout
   android:id="@+id/appBarLayout"
   android:layout_width="match_parent"
   android:layout_height="wrap_content">

   <android.support.design.widget.CollapsingToolbarLayout
    android:id="@+id/collapsingToolbarLayout"
    android:layout_width="match_parent"
    android:layout_height="192dp"
    app:layout_scrollFlags="scroll|exitUntilCollapsed"
    app:titleEnabled="false">

    <LinearLayout
     android:id="@+id/headLayout"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:orientation="vertical"
     app:layout_collapseMode="pin"
     app:layout_collapseParallaxMultiplier="0.7">

     <include layout="@layout/personal_new_top" />
    </LinearLayout>

    <android.support.v7.widget.Toolbar
     android:id="@+id/toolBar"
     android:layout_width="match_parent"
     android:layout_height="44dp"
     android:background="@color/white"
     android:navigationIcon="@drawable/icon_back"
     app:contentInsetLeft="0dp"
     app:contentInsetStart="0dp"
     app:layout_collapseMode="pin"
     app:navigationIcon="@drawable/icon_back">

     <TextView
      android:layout_width="wrap_content"
      android:layout_height="wrap_content"
      android:layout_gravity="center"
      android:singleLine="true"
      android:textColor="@color/c333333"
      android:textSize="16sp"
      tools:text="讲师" />
    </android.support.v7.widget.Toolbar>
   </android.support.design.widget.CollapsingToolbarLayout>

   <include layout="@layout/new_personal_tabs" />
  </android.support.design.widget.AppBarLayout>

  <android.support.v4.widget.NestedScrollView
   android:id="@+id/nestedScrollView"
   android:layout_width="match_parent"
   android:layout_height="match_parent"
   android:fillViewport="true"
   android:scrollbars="none"
   app:layout_behavior="@string/appbar_scrolling_view_behavior">

   <android.support.v4.view.ViewPager
    android:id="@+id/viewPager"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    app:layout_behavior="@string/appbar_scrolling_view_behavior" />
  </android.support.v4.widget.NestedScrollView>
 </android.support.design.widget.CoordinatorLayout>
</android.support.v4.widget.SwipeRefreshLayout>

 @Override
 protected void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 ARouter.getInstance().inject(this);
 setContentView(R.layout.activity_new_personal_card);
 ButterKnife.bind(this);
 setSupportActionBar(toolBar);
 getSupportActionBar().setDisplayHomeAsUpEnabled(true);
 getSupportActionBar().setDisplayShowTitleEnabled(false);
 toolBar.setNavigationOnClickListener(new View.OnClickListener() {
  @Override
  public void onClick(View view) {
  onBackPressed();
  }
 });
 initData();
 }

　　private void initRefresh() {
 appBarLayout.addOnOffsetChangedListener(new AppBarLayout.OnOffsetChangedListener() {
  @Override
  public void onOffsetChanged(AppBarLayout appBarLayout, int verticalOffset) {
  if (verticalOffset >= 0) {
   swipeRefreshLayout.setEnabled(true);
  } else {
   swipeRefreshLayout.setEnabled(false);
  }
  }
 });
 swipeRefreshLayout.setOnRefreshListener(new SwipeRefreshLayout.OnRefreshListener() {
  @Override
  public void onRefresh() {
  initData();
  swipeRefreshLayout.setRefreshing(false);
  }
 });
 }

android:theme="@style/personalCard"

<style name="personalCard" parent="Theme.AppCompat.Light.DarkActionBar">
  <!-- Customize your theme here. -->
  <item name="windowActionBar">false</item>
  <item name="windowNoTitle">true</item>
  <item name="colorPrimary">@color/colorPrimary</item>
  <item name="colorPrimaryDark">@color/colorPrimaryDark</item>
  <item name="colorAccent">@color/colorAccent</item>
 </style>

compileSdkVersion 24
//------------------ 在线依赖开始 ----------------
compile 'com.android.support:appcompat-v7:24.2.0'
compile 'com.android.support:recyclerview-v7:24.2.0'
compile 'com.android.support:cardview-v7:24.2.0'
compile 'com.android.support:design:24.2.0'